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Poster: lwilton Date: Jan 17, 2005 12:03pm
Forum: prelinger Subject: sound quality

I've noticed a number of the movies I've looked at have less than sterling sound quality. In a number of cases this is fairly easy to fix; it just takes someone with the tools, time, and patience to fix them.

I'm planning on fixing the sound on a number of these for my own use, just to make them tolerable to watch.

The question is, is there any way I could then re-upload a replacement for the original that had the improved sound quality? I can't see offhand why anyone would want to keep the image with the bad sound. In most cases this was pretty obviously a fault in copying the movie and not really a problem with the original sound track. So I can't see a "historical accuracy" reason to keep the bad sound.

It appears that I could upload the movie as a new movie. But since I didn't upload any of the originals, I can't see how I could replace a movie.

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Poster: Visual16 Date: Jan 17, 2005 7:32pm
Forum: prelinger Subject: Re: sound quality

I've thought about similar ideas, as well. I have learned to merge the films that are in two or more parts(many of them) into a continous file making them easier to watch. Sometimes missing files have been reposted in "open source" movies, but that created some confusion. Someone took some real time and created a music-sound effects track to a great silent called The Tip-Tops in Peppyland and I think it is still online.
For most better software editors, you can extract the audio MP2 and then remix audio and video streams after editing. I would love to see Hemp for Victory fixed, but its lots of work resampling and guessing until everything syncs. I think that one is in feature films section.

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Poster: ccandreva Date: Jan 24, 2005 5:01am
Forum: prelinger Subject: Re: sound quality

That would be me. It's in the Open Source movie section as "Tip Tops in Peppyland (with sound)"

It was a lot of fun to do.

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Poster: munpfazy Date: Jan 30, 2005 5:16am
Forum: prelinger Subject: Re: sound quality

Just curious - what sort of problems are you hearing? Crackle and hum on th track, gaps, speed problems, or something else?


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Poster: lwilton Date: Jan 30, 2005 12:00pm
Forum: prelinger Subject: Re: sound quality

It depends on the movie, but in general the problems (usually not all on the same movie) are:

1. Very low volume.
2. A high-pitched loud tone, and very low volume for the dialog.
3. Projector soundhead and loop noise.
4. Excessive hiss, sometimes drowning the dialog.
5. 50 or 60 Hz hum, often with 2nd through 4th harmonic.
6. Gradual fading of level as the movie progresses.
7. Poor equalization curves typical of 16mm films with optical tracks.
8. Popping and sputtering from extremely poor splices in the reel.

And probably a few other problems I don't recall at the moment. But the above list covers most of what I've come across.

Now, I'm not saying ALL of the movie sound tracks are bad; they are not. But I am saying that SOME of the soundtracks are bad. Not surprisingly the older films tend to be in worse shape, as are some of the educational films.